Influence of cationic structures on oxygen reduction reaction at Pt electrode in fluorohydrogenate ionic liquids

Kiatkittikul, Pisit; Yamaguchi, Jumpei; Taniki, Ryosuke; Matsumoto, Kazuhiko; Hagiwara, Rika

doi:10.1016/j.jpowsour.2014.05.019

Cited by 18 publications

(16 citation statements)

References 51 publications

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“…where F and C are Faraday constant and solubility of oxygen (0.58 mmol dm ¹3 for EMPyr(FH) 1.7 F at 298 K), 9 respectively. The values of n for Pt and Pt alloys are assumed to be 4.…”

Section: Resultsmentioning

confidence: 99%

“…7 However, in our later studies, N-ethyl-N-methylpyrrolidinium fluorohydrogenate (EMPyr(FH) 1.7 F) was found to exhibit a higher activity toward the oxygen reduction reaction (ORR) on Pt electrodes and give a lower H 2 O 2 yield than other FHILs, 8,9 making it a more promising electrolyte for nonhumidified fuel cells. A single cell using this FHIL had a higher maximum power density than that of the first reported FHFC.…”

Section: Introductionmentioning

confidence: 95%

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Catalytic Activities of Pt–Metal Alloys on Oxygen Reduction Reaction in Fluorohydrogenate Ionic Liquid

2016

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Oxygen reduction reaction (ORR) rate constants (k) on Pt and Pt-M (M = Fe, Co, Ni) electrodes were evaluated in N-ethyl-N-methylpyrrolidinium fluorohydrogenate (EMPyr(FH) 1.7 F) ionic liquid at 298-333 K. The Pt-Fe electrode exhibited the best catalytic activity in EMPyr(FH) 1.7 F, because of the large surface area of its nanoporous structure after Fe dissolution. X-ray photoelectron spectroscopy and field-emission scanning electron microscopy showed that Co and Ni barely dissolved in EMPyr(FH) 1.7 F. The observed ORR activities of Pt-Co and Pt-Ni alloys were lower than that of Pt in EMPyr(FH) 1.7 F.

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“…where F and C are Faraday constant and solubility of oxygen (0.58 mmol dm ¹3 for EMPyr(FH) 1.7 F at 298 K), 9 respectively. The values of n for Pt and Pt alloys are assumed to be 4.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Catalytic Activities of Pt–Metal Alloys on Oxygen Reduction Reaction in Fluorohydrogenate Ionic Liquid

2016

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“…This pathway was confirmed by measuring the increase in the PIL's H 2 O content as a function of the electrolysis time. Similarly, Nohira and co-workers observed the 4e À reduction ORR in fluorohydrogenate RTILs, in which protons are transported by the fluorohydrogenate ions [47]. In contrast, Zhao and co-workers studied the ORR in a number of PILs and suggested that the ORR proceeded via a 2e À reduction to H 2 O 2 based on a digital simulation of the ORR cyclic voltammogram [26].…”

Section: Electrocatalysis Of the Oxygen Reduction Reaction In Rtilsmentioning

confidence: 97%

Electrocatalysis in Room Temperature Ionic Liquids

Ejigu

Walsh

2015

Electrochemistry in Ionic Liquids

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Due to their high thermal and electrochemical stabilities, low vapour pressures, and the ability to readily alter their properties by changing the identity of the constituent ions, RTILs are being used as electrolytes in an increasing number of electrochemical investigations [1][2][3][4]. For example, many fundamental studies have explored the effects of changing the compositions of RTILs on parameters such as their viscosities and electrochemical windows, which are often up to 5 V wide [5,6]. The effects of the RTIL environment on molecular diffusion and electron transfer dynamics have also been studied in detail using simple redox species such as ferrocene [7][8][9]. Such studies have revealed that molecular diffusion coefficients are often up to three orders of magnitude lower in RTILs than in conventional aqueous and nonaqueous electrolytes due to the relatively high viscosities of most RTILs.In parallel with fundamental investigations into the electrochemical behaviour of RTILs, many groups have begun to use RTILs as electrolytes in electrochemical energy-conversion and storage devices. The high thermal stabilities of many RTILs have prompted the development of safer Li batteries by substituting RTILs for volatile and flammable organic electrolytes [10,11]. A number of groups have also begun to use RTILs as electrolytes in intermediate temperature (>100 C) fuel cells because, unlike the Nafion electrolytes usually used in proton exchange membrane fuel cells (PEMFCs), many RTILs can conduct protons in the absence of bulk water [12][13][14][15]. Due to the wide electrochemical windows of some RTILs, large amounts of energy can be stored in RTIL-based supercapacitors [16]. As these examples show, RTILs undoubtedly exhibit many properties that make them attractive for use in electrochemical energy conversion and storage. However, sluggish mass

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“…Thus, the geometry of the solid has been changed to fulfill the specific requirement of a process [8,9]. But, most of these modifications were based on the results obtained by the process itself and not by the investigation of the phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Influence of Geometry and Velocity of Rotating Solids on Hydrodynamics of a Confined Volume

Carvajal-Mariscal

Real-Ramirez

Sanchez-Silva

et al. 2017

Mathematical Problems in Engineering

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Three cylinder-based geometries were evaluated at five different rotating speeds ( = 20.94, 62.83, 94.25, 125.66, and 157.08 rad⋅s −1 ) to obtain the fluid flow pattern in nonsteady conditions. Two of the models were modified at the lower region, also known as tip section, by means of inverted and right truncated cone geometries, respectively. The experimental technique used a visualization cell and a Particle Imaging Velocimetry installation to obtain the vector field at the central plane of the volume. The Line Integral Convolution Method was used to obtain the fluid motion at the plane. In addition, the scalar kinetic energy and the time series were calculated to perform the normal probability plot. This procedure was used to determine the nonlinear fluid flow pattern. It was also used to identify two different flow regimens in physical and numerical results. As the rotation speed increased, the turbulent regions were placed together and moved. The process makes experimental observation difficult. The biphasic and turbulence constitutive equations were solved with the Computational Fluid Dynamics technique. Numerical results were compared with physical experiments for validation. The model with the inverted truncated cone tip presented better stability in the fluid flow pattern along the rotation speed range.

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Influence of cationic structures on oxygen reduction reaction at Pt electrode in fluorohydrogenate ionic liquids

Cited by 18 publications

References 51 publications

Catalytic Activities of Pt–Metal Alloys on Oxygen Reduction Reaction in Fluorohydrogenate Ionic Liquid

Catalytic Activities of Pt–Metal Alloys on Oxygen Reduction Reaction in Fluorohydrogenate Ionic Liquid

Electrocatalysis in Room Temperature Ionic Liquids

Influence of Geometry and Velocity of Rotating Solids on Hydrodynamics of a Confined Volume

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Influence of cationic structures on oxygen reduction reaction at Pt electrode in fluorohydrogenate ionic liquids

Cited by 18 publications

References 51 publications

Catalytic Activities of Pt&ndash;Metal Alloys on Oxygen Reduction Reaction in Fluorohydrogenate Ionic Liquid

Catalytic Activities of Pt&ndash;Metal Alloys on Oxygen Reduction Reaction in Fluorohydrogenate Ionic Liquid

Electrocatalysis in Room Temperature Ionic Liquids

Influence of Geometry and Velocity of Rotating Solids on Hydrodynamics of a Confined Volume

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Product

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Catalytic Activities of Pt–Metal Alloys on Oxygen Reduction Reaction in Fluorohydrogenate Ionic Liquid

Catalytic Activities of Pt–Metal Alloys on Oxygen Reduction Reaction in Fluorohydrogenate Ionic Liquid